Theorists Who Have Disputed Chomsky's View of Language Development by Pointing

Theorists who have disputed Chomsky's view of language development by pointing out that the communicative function of language is key to understanding language development would be MOST interested in:

A) electrical activity in the brain taking place while speaking.
B) children who are deaf's development of their own sign language with a regular grammatical structure in the absence of language exposure.
C) children's ability to use the social context to interpret others' speech.
D) statistical regularities of speech.